.\" Copyright (c) 1998 Alex Nash
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.\" $FreeBSD: src/lib/libc_r/man/pthread_rwlockattr_setpshared.3,v 1.7 2001/10/01 16:09:09 ru Exp $
.\"
.Dd August 4, 1998
.Dt PTHREAD_RWLOCKATTR_SETPSHARED 3
.Os
.Sh NAME
.Nm pthread_rwlockattr_setpshared
.Nd set the process shared attribute
.Sh SYNOPSIS
.In pthread.h
.Ft int
.Fo pthread_rwlockattr_setpshared
.Fa "pthread_rwlockattr_t *attr"
.Fa "int pshared"
.Fc
.Sh DESCRIPTION
The
.Fn pthread_rwlockattr_setpshared
function sets the process-shared attribute of
.Fa attr
to the value referenced by
.Fa pshared .
.Fa pshared
may be one of two values:
.Bl -tag -width PTHREAD_PROCESS_PRIVATE
.It Dv PTHREAD_PROCESS_SHARED
Any thread of any process that has access to the memory where the
read/write lock resides can manipulate the lock.
.It Dv PTHREAD_PROCESS_PRIVATE
Only threads created within the same process as the thread that
initialized the read/write lock can manipulate the lock.  This is
the default value.
.El
.Sh RETURN VALUES
If successful, the
.Fn pthread_rwlockattr_setpshared
function will return zero.
Otherwise, an error number will be returned to indicate the error.
.Sh SEE ALSO
.Xr pthread_rwlock_init 3 ,
.Xr pthread_rwlockattr_init 3 ,
.Xr pthread_rwlockattr_setpshared 3
.Sh STANDARDS
The
.Fn pthread_rwlockattr_setpshared
function is expected to conform to
.St -susv2 .
.Sh ERRORS
.Fn pthread_rwlockattr_setpshared
will fail if:
.Bl -tag -width Er
.It Bq Er EINVAL
The value specified by
.Fa attr
or
.Fa pshared
is invalid.
.El
.Sh HISTORY
The
.Fn pthread_rwlockattr_setpshared
function first appeared in
.Fx 3.0 .
.Sh BUGS
The
.Dv PTHREAD_PROCESS_SHARED
attribute is not supported.
